Submission #1521454

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define x first
#define y second
#define dbg(x) cout << #x << '=' << x << '\n';
#define ll long long
#define pi pair<int,int>
#define pl pair<long long,long long>
#define lg length()
#define pb push_back
ifstream in("file.in");
ofstream out("file.out");
#define MAXN 100005
#define INF 1000000005
#define LINF 1000000000000000005
#define int long long

int x,cnt,f=1,s,t,y,z,q,D,g,pwr[15];
vector <int> c,p;


int rev(int x){
    int ans=0;
    vector <int> p;
    for(int i=0;i<s;i++) p.push_back(x%10),x/=10;
    for(int i : p) ans*=10,ans+=i;
    return ans;
}

int32_t main(){
    ios_base :: sync_with_stdio(0);
    pwr[0]=1;
    for(int i=1;i<=13;i++) pwr[i]=pwr[i-1]*10;
    cin >> D; x=D;
    while(x){
        if(x%10!=0) f=0;
        else if(f) cnt++,D/=10;
        if(!f) c.push_back(x%10);
        x/=10;
    }
    for(int i=0;i<=1;i++){
        s=c.size();
        if(s<2) {c.push_back(0);continue;}
        for(int j=0;j<pwr[s/2];j++){
            p.clear();
            x=j; z=0;
            for(int k=0;k<=s/2-1;k++){
                y=x%10+z; z=0;
                q=(c[k]+y);
                if(q>9) q-=10,z=1;
                p.push_back(q);
                x/=10;
            }
            if(!p[0] && !cnt) {c.push_back(0);continue;}
            if(s%2){
                for(int i=0;i<=9;i++){
                    p.push_back(i); x=j; y=(s-1)/2;
                    for(int i=p.size()-1;i>=0;i--,y++) x+=p[i]*pwr[y];
                    if(rev(x)-x==D) g++;//cout << x << ' ' << j << '\n';
                    p.pop_back();
                }
            }
            else{
                x=j; y=s/2;
                for(int i=p.size()-1;i>=0;i--,y++) x+=p[i]*pwr[y];
                if(rev(x)-x==D) g++;//cout << x << ' ' << j << '\n';
            }
        }
        c.push_back(0);
    }
    if(cnt) g*=9,cnt--;
    while(cnt) g*=10,cnt--;
    cout << g;
}

Submission Info

Judge Result